The function C(x)= -2x^2+38x+40 models the sales, in hundreds of millions of dollars, of compact discs for years since 1990. Part A: Rewrite the function to reveal when sales of compact discs are $0
Part B: What are the zeros of the function?
Part C: Use the context to interpret the zeros.
Please show the steps it would help me out a lot

Idont understand math at all! : o( use this scenario to answer the remaining questions: brenton purchased a new bedroom set for $4,500.00. he lives in arizona and pays a 8.75% sales tax. if he made a 50% down payment and financed the rest, what amount did he finance? what is the total sales tax brenton will pay? enter your answer in currency format, round to the nearest cent. what was brenton's total amount financed? enter your answer in currency format, round to the nearest cent.

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?

Hurry if the population of of an ant hill doubles every 10 days and there are currently 100 ants living in the ant hill what will the ant population be in 20 days